Steve,
I have been using MRP for something like 20 years, but I bought out the MRP supply in a gun shop that was going out of business years ago. I shoot it mostly in my 6mm Rem and 6.5-'06, and have used it in 7mm RM and .22-.243. Norma shows MRP data in their manual for 6.5X55 for 100 gr bullets and up. I haven't seen any data for '06 Improved or .300 Whizzum. My only loading for '06 Improved was with IMR 4350.
good luck...jim
